If you make exempt sales without valid exemption proof, the audit trail lands on you. Resale Proof handles resale-certificate compliance for B2B and nonprofit Shopify stores. Customers upload PDFs via a branded portal or magic-link email — no Shopify login. Per-state validation catches typos before signature. Approved certs auto-apply exemption at checkout. One-click audit-bundle PDF export. Pro adds exemption-cert sync to QuickBooks.

• Per-state form library — MTC, CA, TX, NY, IL — filled in-app or upload-only
• Magic-link upload — buyers send certs via email, no Shopify account needed
• Audit-ready PDF bundle — cover sheet, state TOC, signed certs in one click
• AI OCR pre-fill (Pro) — reads PDFs, auto-fills state + permit number
• Cert sync to QuickBooks (Pro) — pushes cert records + exemption audit data